Figure 1.

Illustrated from left to right are examples of the six classes for the Nascimento nomenclature; the leftmost panel is the case of “Correct Detection” also known as 1-1 correspondence between the manual segmentation and the automated segmentation. The next two cases are “Detection Failure” or 0-1 correspondence, were there is a manual segmentation but no overlapping object in the automated segmentation, and “False Alarm” or 1-0 correspondence. The next three cases are the object detection classes known as “Merge”, “Split”, and “Split-Merge”. The 1-N or “Merge” case occurs when the automated segmentation has merged the multiple objects from the manual segmentation into a single object. Next is M-1, “Split”, in which a single manually segmented object has been split into multiple objects by the automated approach. Finally, on the right, M-N, are multiple manually segmented objects split and merged by the automated segmentation.